In a small bowl, whisk the baking soda with the adobo sauce. In a large saucepan, combine the sugar with the butter, salt and 1/2 cup of water and bring to a boil, stirring until the sugar dissolves. Boil over moderate heat without stirring until a golden caramel forms, about 13 minutes. Remove from the heat and stir in the adobo mixture; the syrup will foam. Immediately drizzle the hot caramel over the popcorn and, using 2 greased spoons, toss to coat. Spread the caramel corn on the prepared baking sheets in an even layer and let cool completely before serving.